one out of three children in the united states is currently considered obese or overweight. >>> a new device promises to give new freedom to millions of people with diabetes. bigat shaban has a look at what is being called a look at the artificial pancreas. >> reporter: 38-year-old tracy cohen has type 1 diabetes. so she watches every bite. >> in terms of either carbohydrates or how much insulin i need. >> reporter: a pump on her stomach injects her with the insulin her pancreas can't create on its own. for more than 30 years, tracy has had to test her blood sugar levels up to 15 times a day. then type the dosage of insulin she needs into the pump. but now, she's testing out a revolutionary device in santa barbara. it's called the artificial pancreas. >> i don't have to go in and say, my blood sugar is this. therefore, i'm going to do this. it figures is all out for you. >> while many use a pump and glucose monitor, researchers are using a device to connect the two. >> it takes some of the thought process and some of the hassles of interacting with pumps. and sensors. and automates th